Installation Guide

8. OuTSIDE AND INSIDE CORNERS
There are two main methods used for outside
corners. The choice depends primarily on the
desired appearance but also the experience and
skill of the installer.
Mitered corners offer a professional looking
nish. They are most commonly used with
horizontally applied siding applications such
as bevel. Mitered corners require good
carpentry skills. They must t tightly for the full
depth of the miter.
Corner boards are a popular and easier alternative to mitered corners. Thickness of the corner board will depend
on the thickness of the siding. The most common are 3/4 inch or 1-1/4 inches thick. Width is a matter of taste
and proper proportion. Corner boards are applied to the sheathing with siding tting tightly against the narrow
edge of the boards, allowing for expansion and an adequate caulking bead. The corner boards and the ends of the
siding are nailed to the corner studs which anchors the wood for a maintenance-free joint. Designing roofs with
an eaves overhang to protect corners from weathering also helps ensure trouble-free joints. Always apply primer
or stain end cuts. With corner boards, there is the choice of applying them next to the siding or over top of the
siding as shown here.
As in the above illustration, at inside corners, siding is frequently butted against a 2 x 2 trim strip. It can also be
butted against adjoining walls with a trim strip used to cover the joint.
9. FIELD JOINTS
When butt jointing siding, cut ends at 45 degree angles to form an overlapping joint. This is particularly important
for vertical installation. Ensure joints meet on studs, blocking or furring strips with the nail penetrating solid
wood at least 1¼ inches.
INSTALLATION
WESTERN RED CEDAR
SIDING
14
(B) Corners boards
Cedar siding
Sheathing
House wrap
Corner boards
Provide additional stud to allow for
nailing at ends of siding
Caulk
joints
Cedar siding
Sheathing
House wrap
Corner boards
Provide additional stud to allow for
nailing at ends of siding
Caulk
joints
Trim
(C) Trim boards
Cedar siding
(A) Mitered Corners
Sheathing
House wrap